51单片机简易计算器可算小数

1、51单片机简易计算器使用时注意调节wi对比度vcc20191517161514B121110981654321Pl.l DB2Pl.2 DBSPl 3 DB4Pl 4 DB5Pl 5 DB6Pl 6 DB7Pl.7 DBSrstP3.0P3.1PS.2THOTfP14P3.5P5.6P3.7GNDX2SS幻P1.0 DB1GND5TC/AT89S52 1234O12 34567T11 41 IX 1 11 PPPPPPPPR1 2 3 斗 5 6 7 CO 9o 1 2 345678 0-0vccPOOP01P0.2P0.3P04P0.5P0.6P0.7氐ALEP2.7P2 6P25P24P2

2、3P22P2 1P2.0403938373635343332313029282726252-12122211011121314151617IS1920VCC Pl10K#include#include #define uchar unsigned char#define uint unsigned int sbit beep=P2A3;sbit dula=P2A6;sbit wela=P2A7;sbit rw=P1Al；sbit rs=P1A0；sbit lcden=P2A5;void yunsuan();void keyinput(char s);void write_data(char d

3、data);void write_com(char command);void displaying a);void init();void dealerror();void dataoverflow();void welcome();char code table1=0xee,0xde,0xbe,0x7e,0xed,0xdd,0xbd,0x7d,0xeb,0xdb,0xbb,0x7b,0xe7,0xd7,0xb7,0x77;char code table2=789/456*123-.0=+;char j,k,temp,temp1,temp2,key,mchar,m,flag2=0,flag3

4、=0;long x,y,num;int operators,input,iny;char error5=error;char overflow8=overflow;char welcome_16=welcome to use r：void delay(uint x)/ 延时uint a,b;for(a=x;a0;a-)for(b=10;b0;b-);void delay_ms(uint x) 延时uint a,b;for(a=x;a0;a-)for(b=110;b0;b-);void write_com(uchar com)/ 写命令P0=com;rs=0;lcden=0;delay(10);

5、lcden=1;delay(10);lcden=0;void write_data(uchar date)/ 写数据PO=date;rs=1;lcden=O;delay(10);lcden=1;delay(10);lcden=0;long ming(int x)long m;switch(x)case 9:m=1000000000;return m;break;case 8:m=100000000;return m;break;case 7:m=10000000;return m;break;case 6:m=1000000;return m;break;case 5:m=100000;ret

6、urn m;break;case 4:m=10000;return m;break;case 3:m=1000;return m;break;case 2:m=100;return m;break;case 1:m=10;return m;break;case 0:m=1;return m;break;void displaying a)long d;int i,flag1=0,temp,c=-1;init();if(avO)a=a*c;write_data(-);for(i=9;i=0;i-)d=mi ng(i);temp=a/d;a=a%d;if(temp=0)&( flag1=0)els

7、ew riCDd asr(0x30+CDm p) f-aglA八=h(llH2)宀wriCDdasr2 和引“ 5X7 目選a口 de-ay(20)八wriCDlcom(oxoe)二/TMWde-ay(20)八wriCDcom(0x06)二/lMwi计“ 也苹孑delay(20);write_com(0x01); /清屏幕指令，将以前的显示内容清除delay(20);void yunsuan() / 运算if (iny)switch(operators)case 1:x=x+y;num=x;if(num-10000000000)display(num);elsedataoverflow();b

8、reak;case 2: x=x-y; num=x;if(num-10000000000) display(num);elsedataoverflow();break;case 3:x=x*y;num=x/100;if(num-10000000000)display(num);elsedataoverflow();break;case 4:if (y=0)dealerror();elseif(yvlOO)x=x*100;y=y*100;y=y/100;x=x/y;num=x;if(num-1OOOOOOOOOO)display(num);elsedataoverflow();break;y=0

9、;void dealerror() 除数为 0int i=0;write_com(0x01);for(i=0;i5;i+)write_data(errori);void dataoverflow() 数值溢出int i=0;write_com(0x01);for(i=0;i8;i+)write_data(overflowi);void welcome。/ 欢迎界面int i=0;write_com(0x01);for(i=0;i16;i+)write_data(welcom ei);void keyiput(char s) / 键盘输入if(s=0) /判断按下的键是否为数值if(flag3=

10、0)num=num*1O+1OO*(s-O);elsenum=num*10+10*(s-0);if(flag2=1)num=num/10;flag3=1;if (operators。)y=num;iny=1;elsex=num;if(num-10000000000)/ 当前数值是否超出限定范围display(num);elseelseswitch(s)case .:/*iny=O;operators=0;*/flag2=1;break;case =:write_data(table214);delay(10);yunsuan();iny=0;operators=0;num=0;flag2=0;

11、flag3=0;break;case +:if (operators)yunsuan();operators=1; write_data(table215); num=0;flag2=0;flag3=0;break;case -:if (operators) yunsuan();operators=2;write_data(table211);num=0;flag2=0;flag3=0;break;case *:if (operators) yunsuan();operators=3;write_data(table27);num=0;flag2=0;flag3=0;break;case /:if (operators)yunsuan();operators=4;write_data(table23);num=0;flag2=0;flag3=0;break;void main() / 主函数char i;char flag0=1;init();for(i=0;i10;i+) delay_ms(100);